#include <stdio.h>

int main() {
    char *str = "Hello, World!";
    char ch = '\xaa';
    printf("%x\n", ch);
    int a[3][4] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
    int rows = sizeof(a) / sizeof(a[0]);
    int cols = sizeof(a[0]) / sizeof(a[0][0]);
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }
    return 0;
}
